The letter reads as follows:
"I am deeply saddened by the news of the murder of 13 innocent Turkish citizens as a result of a treacherous terrorist act in Iraq.
We are extremely outraged by this horrific act of terrorism against civilians and strongly condemn all forms of terrorism.
On my own behalf and on behalf of the people of Azerbaijan, I extend my deepest condolences to the families and relatives of the victims".
Note, Turkish soldiers conducting an operation against Kurdistan Workers Party (PKK) militants in northern Iraq have found the bodies of 13 kidnapped Turks executed in a cave, the Turkey's defence minister Hulusi Akar said.
Turkey launched a military operation against the PKK in northern Iraq’s Gara region on Feb. 10 to secure its border and find citizens who had been kidnapped previously, Akar said in a statement released by his ministry on Sunday.